Expansion bolt-anchor.



H. B. NEWHALL. EXPANSION BOLT ANCHOR. APPLICATION FILED AUG. 23, 1907.

Patented Apr. 20, 1909.v

2 SHEETS-SHEET 1.

A TTOHNE y-S H. B. NEWHALL. EXPANSION BOLT ANCHOR. APPLIUATION FILED AUG. 23, 1907. 919,205, Patented Ap1z20, 1909.

2 SHEBTSSHJ3IIT 2.

UNITED STATES PATENT Omar.

EXPANSION soLr-Arronon.

Specification of Letters Patent.

Patented April 20,1909.

Application filed August 23, 1907. Serial No. 389,816.

To all whom it may concern:

Be it known that l, HENRY B. NEWHALL, a citizen of the United States, resid' at Plainfield, in the county of Union and tate of New Jersey, have invented certain new and useful Improvements in Exp ansion Bolt- Anchors, of which the following is a specification, taken in connection with the acconb panying drawings.

This invention relates to expansion bolt anchors, and more particularly to such an chors as will not mar or deface the support in which the anchor is mounted.

In the accompanying drawings in which the some reference numerals refer to similar parts in the several figures, Figure 1 is a vertical section taken through a sup Jort of ma sonry or other similar material, s owing the bolt anchor in operative or expanded position. Fig. 2 is a perspective view of one form of my expansion bolt anchor, a part being broken away to better illustrate the in terior. Fig. 3 is a vertical section taken on the line 33 of Fig. 1. Fig. i is a rear or end view of the expansion bolt anchor. Fig. 5 is a top or plan view of the bolt anchor. a modified form of expansion bolt anchor. Fig. 7 is a vertical section, taken on the line 7 7 of Fig. 6, showing a side elevation of one of the two halves of this form of bolt anchor. Fig. 8 is a central longitudinal section showing a 'modiiied form of anchor and expanding means. Fig. 9 is a central longitudinal section of a bolt anchor similar to that illustrated in Fig. 8 showing a diilerent form'of screw for expanding the prongs. Fig. 10 is an end elevation of a modified construction. Fig. 11 is a longitudinal side elevation taken on the line 11, 11 of Fig. 10 looking in the direction of the arrows.

In the illustrative embodiment of this invention shown in the drawings, 1 isa support ofonasonry, wood or any suitable material in which a cavity 2 has been formed in any suitable way to receive an expansible bolt an' chor, 3. This expansible bolt anchor is preferably formed as shown in Figs. 1 to 5 and 8 and 9, in the form of a cylinder, havin a hollow uninterrupted body portion 4, t e rear portion of the cylinder 3 being formed into a plurality of pror gs or tines 5, 5 by means of bisectin slots (it 6 which extend as clearly shown in Big. 2, ap roximately three-quarters of the length 0- the o *linder, 3, though the precise length of the s ots is immaterial.

{ Though I have shown four prongs or tines, l 5, 5, *igs. 2=and 4) it is to be of course 111163101- 5 stood that a greater or less number may be i used without departing from the spirit of my 5 invention. On the interior of one or more of the tines 5, 5, 1 form bending recesses 7, 7, which are preferably arranged near the junction of the tines 5, 5 with the body portion 4,

for a purpose to be hereinafter described.

The interior of the expansible bolt anchor l 3 is made tapering as shown at 8, the diameter of the opening 18, gradually decreasing from the body or tion 4 to the ends of the tines 5, the srna est diameter 910i the internal o 'ening 8, being at the extreme end. of 5 the tines, 5, 5, (Fi 1). l The interior of the expansible bolt anchor may be screw-threaded as shown at '16, (Fig. 2), or it may be left blank, (Figs. 1 and 7) the female screw-threads being formed by the male threads 11 u n the screw, '12. p

In Figs. 6 and 7, l ave shown an expam sible bolt anchor formed of two seplarate members, 13 and 14, which are broug t .together as shown in Fig. 6, to form an expansible bolt anchor, the screw 12, being inserted between the two members to expand them laterally in the well known manner. also arrange in the interior, of one or both of these members, 13 and 14, bending recesses, 7, 7, it of course being understood that one or more of such recesses may be used.

instead of usin a screw, such as shown in Fig. 1,"'to expan the anchor, I may use a screw, such as 20 (Fig. 8), having machine screw threads 21 cooperatin with sirnilar 'rnachine screw threads 22 :ormed' the body portion Act the bolt anchor. In this form of my invention, the end 23 of the screw 20 is formed tapering and without screw-threads so as to have awedging action upon the inclined opening 24 formed in the bolt anchor, "this openin 24 having the smallest diameter at 25 which is the opposite end of the bolt anchor from the machine screw threads 22. trated in this figure, of the drawing, the machine screw threads 21 and 22 cooperate in an obvious manner to permit the tapering outward the tines or prongs .5, 5 of the bolt anchor, this wed ing action taking place at a point removed rorn the surface 17 of the support 1 so as not to mar or deface it. I may, however, use a lag screw 26 having l screw threads 27 near its end 28. The por- In my invention as illusend 23 of the screw 20 wedging or forcing ii ures of the drawing.

tion 29 of the screw nearest the head 30 is T formed plain without screw threads as is the interior surface of the body portion 4 of the bolt anchor. In. this form the screw threads 27 upon the lag screw 26 cooperate with the sides 81 of the tapering opening 32 running 5 through the bolt anchor so as to expand the tines 5, 5 inQthe same manner as in the other I may also, to give I a little neater'appearance to the anchor, and P to further guard the surface 17 of the support I 1, cast or otherwise secure an annular flange 40 upon the body portion l of the bolt an- 5 chor, as shown, for instance, in Figs. 8 and 9, 5 though it is to be distinctly understood that my invention is not limited to this additional feature.

In Figs. 10 and 11, I have illustrated a bolt anchor formed of two members, such as shown in Figs. 6 and 7, machine screw threads 22 being formed in one end of the bolt anchor to cooperate with similar machine screw threads 21 upon a screw, such as 20, shown in Fig. 8, the tapering end 23 cooperating with the inclined opening 24 to force the two. members 33, 34 apart and at the same time causing the ends 35 to bend or yield at the necks 16, 16 due to the weakening slots 7, 7. i

It is found in practice that where expan sion bolt anchors are used, the face of the wall or other supporting member 1, is often marred, chipped or defaced by the powerful I expanding action of the screw threads upon the screw, cooperating with those which are 5 either formed in the cxpansible bolt anchors, i or which are made by the male threads upon .5 the screw 12, as the latter is screwed within the expansiblc bolt anchor, 3. To prevent this serious damage, I arrange bending re cesscs 7, 7 in the expansible anchor some little distance back from the front or face. 15,' of the oxpansiblc bolt anchors so that in the construction shown in Figs. 1 to 5, and 8, the f body portion 4 of the bolt anchor will act 1 merely as a nut for the screws 12 and 20 rei spectively, the expansion of the bolt anchor taking place at the bending recesses 7, 7, the necks 16, 16 readily permitting this cxpan-- sion of the bolt anchor well within the cavity 2, and away from the face 17 of the su port 1, thereby preventing the support being marred or broken at this point. The constructions illustrated in Figs. 8 and 9 operate in substantially the same manner, each in suring a positive and firingrip of the bolt an chor with its support without niarring or chipping the face 17.

The bending recesses 7, Tshown in the two part bolt anchor illustrated in Figs. 6, 7, 10 and 11 perform exactly the same function of permitting the bolt anchor to bend or expand well within the cavity 2 of the support 1 and removed from the surface 17 of such support.

Having thus described this invention in connection with the several illustrative embodiments thereof, to the details of which I do not desire to be limited, what is claimed as new and what is desired to be secured by Letters Patent is set forth in the appended claims.

1. An expansion bolt anchor having a surface ada ted to be located approximately flush wit 1 the surface of the support, a plurality of bending recesses arranged within the body of the bolt anchor and removed from the face of the anchor, and a screw or bolt to directly expand it.

2. An ex ansion bolt anchor having a solid or rigi body portion, a face on the body portion adapted to be brought approximately flush with the surface of the support, one or more tines or prongs and a plurality of cooperate with the anchor to bonding recesses on the inner side of each tine or prong arranged at different distances from the body portion, to control and govern the angle of expansion.

v HENRY B. NEWUJUJL Witnesses:

Jnssln B. KAY, ALAN M. JonNsoN. 

